Safety-valve



BATENTED FEB. 16, 1904) 0. 0. PALMER.

SAFETY VALVE APPLICATION FILED NOV. 3, 1902 N0 MODEL.

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CASSIUS CLAY PALMER, OF NEW AND STATIONARY REFR[GERA 1 N(J DELAWARE.

Patented February 16, 1904.

PATENT OFFICE.

COMPANY, A CORPORATION OF SAFETY-VALV E..

SPECIFICATION forming part of Letters Patent N0. 752,099, dated February 16, .1904. Application filed November 3, 1902. Serial No. 129,306- .No model.)

- To aZZ whom, it new concern:

Be it known that I, OAsslus CLAY PALMER, a citizen of the United States, and a resident of N ew York city, borough of Manhattan, in the county and State of New York, have invented a new and useful Improvement in Safety-Valves, of which the following is a specification.

' This invention constitutes an improvement upon the valve described in my Patent No. 689,512, dated December 24:, 1901, in which patent the valve was seated upon a ring com posed wholly or in part of fusible material, by the fusion of which under abnormal temperature the escape of pressure was permitted.

In the accompanying drawingIhave shown in sectional elevation a valve containing my present invention.

Pressure-passage 1 extends into a pocket 2 in the casting 3, from one side of which extends the passage 4: through the nipple 5, upon which is screwed the casing 6, from the top of which extendsthe' exhaust-passage 7. The casing '6' contains the chamber 4:, leading from the passage 4 to the. exhaust-passage 7.

Within thechamber 4: are situated the valve 9, whereby the passage 4; is normally closed, and the mechanism whereby said valve is normally held. This valve 9 is seated upon a ring 10, secured to the end oi the nipple 5.

The stem 11, which bears against the rear of the valve 9, is inserted at its rear end in a guiding-sleeve 12. The spiral spring 13 is interposed between the disk 14, fixed to the head of the stem and the disk 15, through which the tail of the stem is free to move and which rests against the end of the sleeve 12.

Thus so long as the sleeve 12 maintains its normal position the valve 9 will beheld to its seat by the yielding pressure of the spring 13.

The sleeve 12 extends through the head of the casing 6 with freedom of longitudinal movement therethrough, and against its outer end bears a plug 16, of fusible material, ad-

justahly held by a set-screw 17, mounted in a yoke 18, whichtits onto the head of the easing 6. This yoke is provided with lateral openings 19, so that the fusible plug 16 is sub stantially open to the influence of surrounding heat. The joint bet-ween the yoke 18 and the casing 6 at- 20 may be made of fusible iolder, which is also exposed to surrounding eat.

The pocket 2 is filled, as indicated in the drawing, with a fluid which seals the passage 4 and which may consist of glycerin.

This valve is superior to that shown in my said Patent No. 689,512, for the reason, among others, that the fusible material (by the fusion of'which the valve is permitted to open) instead of being located, as in that patent,with in the chamber, and therefore removed from the direct influence of surrounding heat, is located substantially outside of the valvechamher, and therefore in a position where it may remain exposed to the direct influence of the heat, which it is desired should efi'ect the opening of the valve with the least possible delay. This structure also possesses advantages over the structure of said Patent N 0. 689,512, in that the downwardly-extendihg pocket 3, from one/side of which the valved passage extends, constitutes an improved receptacle for the fluid seal on the pressure side of said valve.

Having thus described my invention, claim as new and desire to secure by Letters Patent- 1. In combinatiomadownwardly-extending pocket 3 adapted for attachment to a passage for fluid under pressure, a liquid seal in said pocket, apassage 4 leading from. one side of said pocket, a valve normally closing said passage and a fusible member and sleeve cooperating with said valve to close said passage.

2. In combination,a downwardly-extending pocket 3 adapted for attachment to a passage for fluid under pressure, a passage 4 leading from one side of said pocket, a valve normally YonK, N. Y., TASSIGNOR To RAILWAY 5 closing said passage and a fusible member In testimony whereoflhave hereunto signed and sleeve coperatingwith said valve t9 close my name in the presence of two subscribing said passage. witnesses. q

3. In combination with the valve-cage 6, CASSIUS CLAY PALMER. 5 the valve 9, the spring 13, the guiding-sleeve Witnesses:

12 and the fusible me nber 16, substantially WAI/IER A. PAULING, as described. CHQRLES J. RATHJEN, 

